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Old 08-22-2009, 11:13 PM   #10
Kilo-9
Dog Is My Copilot
 
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Drives: 2011 2SS/RS LS3
Join Date: Jun 2009
Location: Pittsburgh, PA
Posts: 1,375
I have an underdrive on my 4th gen and haven't experienced anything that could be remotely considered trouble. They don't make a dramatic difference, but if you are looking to squeeze every last pony out of your engine, then they're an easy mod. However, modifying vehicles obviously isn't for everyone...
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